freebsd-nq/man/man1/zhack.1
Brian Behlendorf 93ce2b4ca5 Update build system and packaging
Minimal changes required to integrate the SPL sources in to the
ZFS repository build infrastructure and packaging.

Build system and packaging:
  * Renamed SPL_* autoconf m4 macros to ZFS_*.
  * Removed redundant SPL_* autoconf m4 macros.
  * Updated the RPM spec files to remove SPL package dependency.
  * The zfs package obsoletes the spl package, and the zfs-kmod
    package obsoletes the spl-kmod package.
  * The zfs-kmod-devel* packages were updated to add compatibility
    symlinks under /usr/src/spl-x.y.z until all dependent packages
    can be updated.  They will be removed in a future release.
  * Updated copy-builtin script for in-kernel builds.
  * Updated DKMS package to include the spl.ko.
  * Updated stale AUTHORS file to include all contributors.
  * Updated stale COPYRIGHT and included the SPL as an exception.
  * Renamed README.markdown to README.md
  * Renamed OPENSOLARIS.LICENSE to LICENSE.
  * Renamed DISCLAIMER to NOTICE.

Required code changes:
  * Removed redundant HAVE_SPL macro.
  * Removed _BOOT from nvpairs since it doesn't apply for Linux.
  * Initial header cleanup (removal of empty headers, refactoring).
  * Remove SPL repository clone/build from zimport.sh.
  * Use of DEFINE_RATELIMIT_STATE and DEFINE_SPINLOCK removed due
    to build issues when forcing C99 compilation.
  * Replaced legacy ACCESS_ONCE with READ_ONCE.
  * Include needed headers for `current` and `EXPORT_SYMBOL`.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
TEST_ZIMPORT_SKIP="yes"
Closes #7556
2018-05-29 16:00:33 -07:00

99 lines
2.9 KiB
Groff

'\" t
.\"
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.\"
.\"
.\" Copyright 2013 Darik Horn <dajhorn@vanadac.com>. All rights reserved.
.\"
.TH zhack 1 "2013 MAR 16" "ZFS on Linux" "User Commands"
.SH NAME
zhack \- libzpool debugging tool
.SH DESCRIPTION
This utility pokes configuration changes directly into a ZFS pool,
which is dangerous and can cause data corruption.
.SH SYNOPSIS
.LP
.BI "zhack [\-c " "cachefile" "] [\-d " "dir" "] <" "subcommand" "> [" "arguments" "]"
.SH OPTIONS
.HP
.BI "\-c" " cachefile"
.IP
Read the \fIpool\fR configuration from the \fIcachefile\fR, which is
/etc/zfs/zpool.cache by default.
.HP
.BI "\-d" " dir"
.IP
Search for \fIpool\fR members in the \fIdir\fR path. Can be specified
more than once.
.SH SUBCOMMANDS
.LP
.BI "feature stat " "pool"
.IP
List feature flags.
.LP
.BI "feature enable [\-d " "description" "] [\-r] " "pool guid"
.IP
Add a new feature to \fIpool\fR that is uniquely identified by
\fIguid\fR, which is specified in the same form as a zfs(8) user
property.
.IP
The \fIdescription\fR is a short human readable explanation of the new
feature.
.IP
The \fB\-r\fR switch indicates that \fIpool\fR can be safely opened
in read-only mode by a system that does not have the \fIguid\fR
feature.
.LP
.BI "feature ref [\-d|\-m] " "pool guid"
.IP
Increment the reference count of the \fIguid\fR feature in \fIpool\fR.
.IP
The \fB\-d\fR switch decrements the reference count of the \fIguid\fR
feature in \fIpool\fR.
.IP
The \fB\-m\fR switch indicates that the \fIguid\fR feature is now
required to read the pool MOS.
.SH EXAMPLES
.LP
.nf
# zhack feature stat tank
for_read_obj:
org.illumos:lz4_compress = 0
for_write_obj:
com.delphix:async_destroy = 0
com.delphix:empty_bpobj = 0
descriptions_obj:
com.delphix:async_destroy = Destroy filesystems asynchronously.
com.delphix:empty_bpobj = Snapshots use less space.
org.illumos:lz4_compress = LZ4 compression algorithm support.
.LP
# zhack feature enable -d 'Predict future disk failures.' \\
tank com.example:clairvoyance
.LP
# zhack feature ref tank com.example:clairvoyance
.SH AUTHORS
This man page was written by Darik Horn <dajhorn@vanadac.com>.
.SH SEE ALSO
.BR zfs (8),
.BR zpool-features (5),
.BR ztest (1)